2. A core sample from a gas reservoir is to be tested for various properties using nitrogen gas. A 12-cm-long core has a diameter of 4 cm. Calculate: (a) Linear pressure drop across the core if gas-flow rate is 5 cm/s. nitrogen viscosity is 0.012 CP, and core permeability is 50 mD. (b) Actual velocity of the gas if core porosity is 15%, irreducible water saturation is 20%, and inlet and outlet pressures are 10 and 2 atm, respectively (c) Average flow rate through the core, if linear pressure gradient through core is 0.8 atm/s and outlet pressure is 2 atm